Certain bits of a packet, such as bits in the IP header of an IP packet, are used to designate the type of service or quality of service (qos) level to be afforded to the packet as it passes through a data communications network. A user entitled to a certain qos level logs into a service selection gateway ssg. The ssg queries an authentication, authorization and accounting (aaa) server in response to a log-in attempt by the user. Upon authorization, the aaa server returns an access accept signal in addition to an indication from the user's service profile (user profile) as to the qos level to be afforded the user. While the user is logged in, all packets are routed through the ssg. The ssg sets the certain bits of the packet in accordance with the user's assigned qos level so that as the packets are routed through the data communications network, they are consistently afforded the assigned quality of service level. In another aspect of the invention, on-demand qos may be provided by the ssg and accounted for by communications with the aaa server.
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10. An apparatus for setting quality of service (qos) indicator bits of packets sent by a user of a data communications network, said apparatus comprising:
a service selection gateway (ssg) in communication with the user and the data communications network; and
a packet modifier associated with said ssg, responsive to a qos request by the user, setting a qos bit field of packets sent by the user to the data communications network via the ssg,
wherein said ssg is in communication with an aaa server and sends the aaa server information relating to the amount of time that said qos request is in effect.
9. An apparatus for setting quality of service (qos) indicator bits of packets sent by a user of a data communications network, said apparatus comprising:
a service selection gateway (ssg) in communication with the user and the data communications network; and
a packet modifier associated with said ssg, responsive to a qos request by the user, setting a qos bit field of packets sent by the user to the data communications network via the ssg,
wherein said ssg is in communication with an aaa server and sends the aaa server information relating to the number of packets sent by the user to the data communications network via the ssg which are modified in accordance with qos.
5. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
a service selection gateway (ssg) in communication with the user, said ssg receiving a user service profile including a qos level in response to an attempt to log-in by the user, the qos level being associated with the user; and
a packet modifier associated with said ssg, said packet modifier modifying the qos bits of packets sent by the user to reflect the qos level received for the user, said packet modifier modifying all packets transmitted by the user to the data communications network via the ssg,
wherein all modified packets are IP packets and the qos bits are the precedence bits in the ToS/Differentiated Services field of the IP packets.
8. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
a service selection gateway (ssg) in communication with the user, said ssg receiving a user service profile including a qos level in response to an attempt to log-in by the user, the qos level being associated with the user; and
a packet modifier associated with said ssg, said packet modifier modifying the qos bits of packets sent by the user to reflect the qos level received for the user, said packet modifier modifying packets belonging to at least one flow of packets transmitted by the user to the data communications network via the ssg,
wherein all modified packets are IP packets and the qos bits are the precedence bits in the ToS/Differentiated Services field of the IP packets.
18. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
initiating a request to an authentication, authorization and accounting (aaa) server in response to the user's attempt to log-in;
receiving, in response to said request, a user service profile corresponding to the user, said user service profile including a quality of service field, the user service profile being associated with the user;
using said quality of service field to set the qos bits within said packets transmitted by the user;
modifying the qos bits in the packets transmitted by the user; and
communicating, with an authentication, authorization and accounting (aaa) server, information related to the quantity of packets transmitted by the user and modified with respect to the qos bits.
17. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
initiating a request to an authentication, authorization and accounting (aaa) server in response to the user's attempt to log-in;
receiving, in response to said request, a user service profile corresponding to the user, said user service profile including a quality of service field, the user service profile being associated with the user,
using said quality of service field to set the qos bits within said packets transmitted by the user;
modifying the qos bits in the packets transmitted by the user; and
communicating, with an authentication, authorization and accounting (aaa) server, information related to the duration of time that packets transmitted by the user are modified with respect to the qos bits.
22. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for initiating a request to an authentication, authorization and accounting (aaa) server in response to the user's attempt to log-in;
means for receiving, in response to said request, a user service profile corresponding to the user, said user service profile including a quality of service field, the user service profile being associated with the user;
means for using said quality of service field to set the qos bits within said packets transmitted by the user;
means for modifying the qos bits in the packets transmitted by the user; and
means for communicating, with an authentication, authorization and accounting (aaa) server, information related to the quantity of packets transmitted by the user and modified with respect to the qos bits.
16. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
obtaining a user service profile including a qos level for the user in response to a user log-in attempt to a service selection gateway (ssg), the qos level being associated with the user;
routing all packets originated by the user through the ssg during a session;
setting, in the ssg, the qos bits of packets originated by the user in accordance with the qos level for the user;
passing, after said qos bits have been set, said packets on to the data communications network;
modifying, in the ssg, the qos bits of the packets transmitted by the user; and
communicating with an authentication, authorization and accounting (aaa) server information related to the quantity of packets transmitted by the user and modified by the ssg with respect to the qos bits.
21. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for initiating a request to an authentication, authorization and accounting (aaa) server in response to the user's attempt to log-in;
means for receiving, in response to said request, a user service profile corresponding to the user, said user service profile including a quality of service field, the user service profile being associated with the user;
means for using said quality of service field to set the qos bits within said packets transmitted by the user;
means for modifying the qos bits in the packets transmitted by the user; and
means for communicating, with an authentication, authorization and accounting (aaa) server, information related to the duration of time that packets transmitted by the user are modified with respect to the qos bits.
15. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
obtaining a user service profile including a qos level for the user in response to a user log-in attempt to a service selection gateway (ssg), the qos level being associated with the user,
routing all packets originated by the user through the ssg during a session;
setting, in the ssg, the qos bits of packets originated by the user in accordance with the qos level for the user;
passing, after said qos bits have been set, said packets on to the data communications network;
modifying, in the ssg, the qos bits of the packets transmitted by the user; and
communicating with an authentication, authorization and accounting (aaa) server information related to the duration of time that packets transmitted by the user are modified by the ssg with respect to the qos bits.
1. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, comprising:
receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
assigning, in response to said request, a quality of service level to said at least one packet flow;
setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level; and
transmitting said packets belonging to said at least one packet flow to the data communications network,
wherein all of said packets belonging to said at least one packet flow are IP packets, and said qos bits are the precedence bits within the ToS/Differentiated Services field of said IP packets.
19. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for obtaining a user service profile including a qos level for the user in response to a user log-in attempt to a service selection gateway (ssg)), the qos level being associated with the user;
means for routing all packets originated by the user through the ssg during a session;
means for setting, in the ssg, the qos bits of packets originated by the user in accordance with the qos level for the user;
means for passing, after said qos bits have been set, said packets on to the data communications network;
means for modifying the qos bits of the packets transmitted by the user; and
means for communicating, with an authentication, authorization and accounting (aaa) server, information related to the duration of time that packets transmitted by the user are modified with respect to the qos bits.
20. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for obtaining a user service profile including a qos level for the user in response to a user log-in attempt to a service selection gateway (ssg)), the qos level being associated with the user;
means for routing all packets originated by the user through the ssg during a session;
means for setting, in the ssg, the qos bits of packets originated by the user in accordance with the qos level for the user;
means for passing, after said qos bits have been set, said packets on to the data communications network;
means for modifying the qos bits of the packets transmitted by the user; and
means for communicating, with an authentication, authorization and accounting (aaa) server, information related to the quantity of packets transmitted by the user and modified by the ssg with respect to the qos bits.
11. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
means for assigning, in response to said request, a quality of service level to said at least one packet flow;
means for setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level; and
means for transmitting said packets belonging to said at least one packet flow to the data communications network,
wherein all of said packets of said at least one packet flow are IP packets, and said qos bits are the precedence bits within the ToS/Differentiated Services field of said IP packets.
2. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
assigning, in response to said request, a quality of service level to said at least one packet flow;
setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level; and
transmitting said packets belonging to said at least one packet flow to the data communications network;
communicating between the service selection gateway and an aaa server the request; and
communicating between the service selection gateway and the aaa server information related to the quantity of packets transmitted by the user and modified by the service selection gateway with respect to the qos bits.
3. A method for setting quality of service (qos) bits of packets sent by a user of a data communications network, said method comprising:
receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
assigning, in response to said request, a quality of service level to said at least one packet flow;
setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level; and
transmitting said packets belonging to said at least one packet flow to the data communications network;
communicating between the service selection gateway and an aaa server the request; and
communication between the service selection gateway and the aaa server information related to the duration of time that packets transmitted by the user are modified by the service selection gateway with respect to the qos bits.
12. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
means for assigning, in response to said request, a quality of service level to said at least one packet flow;
means for setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level;
means for transmitting said packets belonging to said at least one packet flow to the data communications network;
means for communicating between the service selection gateway and an aaa server said request; and
means for communicating between the service selection gateway and the aaa server information related to the quantity of packets transmitted by the user and modified by the service selection gateway with respect to the qos bits.
13. An apparatus for setting quality of service (qos) bits of packets sent by a user of a data communications network, said apparatus comprising:
means for receiving, at a service selection gateway to which the user is in communication, a request from the user to assign a particular quality of service level to at least one packet flow transmitted by the user;
means for assigning, in response to said request, a quality of service level to said at least one packet flow;
means for setting said qos bits within said packets belonging to said at least one packet flow received at the service selection gateway in accordance with said quality of service level;
means for transmitting said packets belonging to said at least one packet flow to the data communications network;
means for communicating between the service selection gateway and an aaa server said request; and
means for communication between the service selection gateway and the aaa server information related to the duration of time that packets transmitted by the user are modified by the service selection gateway with respect to the qos bits.
4. A method in accordance with
communicating between the service selection gateway and the aaa server information related to the quantity of packets transmitted by the user and modified by the service selection gateway with respect to the qos bits.
6. A method in accordance with
7. A method in accordance with
14. An apparatus in accordance with
means for communicating between the service selection gateway and the aaa server information related to the quantity of packets transmitted by the user and modified by the service selection gateway with respect to the qos bits.
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1. Field of the Invention
The present invention relates to the field of data communications networks. More particularly, this invention relates to a method and apparatus for implementing a quality of service (QoS) policy in a data communications network so as to thereby prioritize network traffic into a plurality of service levels and provide preferential treatment of different classes of data traffic on the data communications network. A number of priority levels may be implemented in accordance with the invention.
2. The Background
This invention relates to switched packet data communications networks. There are a number of different packet types which are used in modern switched packet data communications networks.
As the use of data communications networks increases worldwide, congestion of those networks has become a problem. A given data communications network, a given node on a data communications network, or a given link connecting two nodes has a certain capacity to pass data packets and that capacity cannot be exceeded. When data traffic on the data communications network becomes heavy enough that one can anticipate congestion problems which might lead to packets being dropped, it is desirable to implement a “Quality of Service” or QoS policy so as to give priority to certain types of traffic and/or customers so as not to drop their packets, thus assuring that critical communications are able to pass through the data communications network and/or providing a guaranteed service level, albeit at the expense of less critical communications.
The QoS level mapped into the ToS/Differentiated Services precedence bits (or other bits of the packet) is used by devices such as routers, gateways and switches within a data communications network in a number of ways. For example, packet rate limiting may be imposed to cap a user's throughput of packets to a given contract level specified in a service agreement with the user. In this way limited system services may not be over-used by those paying the least for those services. In another example, packet rate limiting may be imposed under congested network conditions to drop or modify packets based, at least in part, upon the QoS level associated with the packet. Those with a “higher” QoS level will do better in getting their communications through in congested conditions than those with a “lower” QoS level.
One way in which the ToS bits of the IP header are presently used is to use edge routers 38 as shown in
Accordingly, a need exists for a QoS system which can provide for the QoS needs of roaming or DHCP users while simplifying the task of programming QoS levels associated with the user. Furthermore, it would be desirable to provide a QoS system that provides on-demand QoS rather than a fixed QoS for each user to better accommodate the shifting needs of users.
Certain bits of a packet, such as bits in the IP header of an IP packet, are used to designate the type of service or Quality of Service (QoS) level to be afforded to the packet as it passes through a data communications network. A user entitled to a certain QoS level logs into a service selection gateway SSG. The SSG queries an authentication, authorization and accounting (AAA) server in response to a log-in attempt by the user. Upon authorization, the AAA server returns an access accept signal in addition to an indication from the user's service profile (user profile) as to the QoS level to be afforded the user. While the user is logged in, all packets are routed through the SSG. The SSG sets the certain bits of the packet in accordance with the user's assigned QoS level so that as the packets are routed through the data communications network, they are consistently afforded the assigned Quality of Service level. In another aspect of the invention, on-demand QoS may be provided by the SSG and accounted for by communications with the AAA server.
Those of ordinary skill in the art will realize that the following description of the present invention is illustrative only and not in any way limiting. Other embodiments of the invention will readily suggest themselves to such skilled persons after a perusal of the within disclosure.
In accordance with a presently preferred embodiment of the present invention, the components, processes and/or data structures are implemented using a gateway device implemented using C++ programs running on an Enterprise 2000™ server running Sun Solaris™ as its operating system. The Enterprise 2000™ server and Sun Solaris™ operating system are products available from Sun Microsystems, Inc. of Mountain View, Calif. Different implementations may be used and may include other types of operating systems, computing platforms, computer programs, firmware and/or general purpose machines. In addition, those of ordinary skill in the art will readily recognize that devices of a less general purpose nature, such as hardwired devices, devices relying on FPGA (field programmable gate array) or ASIC (Application Specific Integrated Circuit) technology, or the like, may also be used without departing from the scope and spirit of the inventive concepts disclosed herein.
In accordance with a presently preferred embodiment of the present invention, the three Precedence bits (the three highest order or most significant bits of the 8-bit Type of Service (ToS)/Differentiated Services field 26 of the IP packet header) are used to designate the type of service or Quality of Service (QoS) level to be given to packets sourced from a particular user. Those of ordinary skill in the art will realize that the particular bits used are not particularly critical, for example, the CoS (Class of Services) bits of an IEEE 802.1q encapsulated frame could be used as could the CoS bits in an ISL frame. Other bits or fields could also be designated to carry the QoS level information. A 3-bit ToS permits up to 8 levels of service. Initially, more than three bits could be used, if desired.
The present invention makes use of a user's service profile. A service profile, sometimes referred to as a user profile, contains information relating to a particular user's network access account. For example, it may include an identification of the user's last known home PoP (point of presence) or home gateway located in a PoP. It may include the identification of one or more domain name server(s) (DNS) to use in resolving domain names to IP addresses. It may include details about the user's service agreement with the ISP (internet service provider) servicing the user's account. Such information may include an identification of the QoS level to be provided to the user. For example, if the user is a “Platinum” user, he or she might receive a level 8 ToS thus granting his/her packets the best service. A normal user not paying a premium for a higher QoS might be afforded a level 1 ToS.
The user profile is stored in AAA (authentication, authorization and accounting) servers disposed in various locations in the data communications network.
The authentication, authorization and accounting (AAA) server performs user authentication, user authorization and user accounting functions. It may be a Cisco ACS or product such as Cisco Secure, available from Cisco Systems, Inc. of San Jose, Calif., or an equivalent product. In accordance with a presently preferred embodiment of the present invention, the Remote Authentication Dial-In User Service (RADIUS) protocol is used as the communication protocol between the service selection gateway and the AAA server. RADIUS is an Internet standard track protocol for carrying authentication, authorization, accounting and configuration information between a gateway device that desires to authenticate its links and a shared AAA server. Those of ordinary skill in the art will realize that other Internet protocols such as TACSCS+ can be used as acceptable authentication communications links between the various communications devices that encompass the data communications network and still be within the inventive concepts disclosed herein.
The service selection gateway (SSG) is a device which couples the user to the data communications network. The user may log directly into the service selection gateway or may do so via an intermediate server such as a network access server. The term gateway is not meant to be limited to a single type of device, as any device, hardware or software, that may act as a bridge between the user and the network may be considered a gateway for the purposes of this application. In accordance with a presently preferred embodiment of the present invention, the service selection gateway is a model 6510 service selection gateway available from Cisco Systems, Inc. of San Jose, Calif.
Turning now to
This approach provides a number of important advantages. First, the QoS level for the user need only be set once in establishing the user's service profile. The existing AAA system will assure that the user's service profile is available regardless of the PoP that the user logs-in on. This means that roaming users will be supported where they could not easily be supported in the edge router system approach. Second, maintaining and modifying the QoS level associated with a user is quite simple—simply modify the user service profile once. Third, this approach allows implementation of a pay-per-use approach to QoS where a user may negotiate with an SSG to obtain a particular QoS level that the user would not otherwise receive to cover a particular session or one or more particular flows within a session. This could be used where a user desires to send time critical communications such as voice over IP or video over IP where dropouts are distracting and undesirable. In such a case, the user could be billed or in some way charged for the use, if desired. The SSG in conjunction with the AAA server can effectively track the user's use of the on-demand service and send RADIUS (or equivalent) packets to the AAA server. A number of billing and use schemes can now be implemented that were unavailable under the edge router system.
Turning now to
At reference numeral 102 the user attempts log-in at a PoP containing a service selection gateway—either directly or through a network access server or other intermediate server.
At reference numeral 104 the SSG queries an AAA server using the RADIUS (or an equivalent) protocol and obtains the QoS level specified in the user's service profile.
At reference numeral 106 the SSG applies the QoS level for the user by setting the ToS precedence bits of each IP packet sent by the user to the QoS value specified in the user's service profile or to a direct mapping of that value. Note that QoS level may be implemented using other bits in the packet as would be apparent to those of ordinary skill in the art.
The above procedure describes a “subscription”-based QoS approach. A different “pay-per-use” QoS approach is detailed in FIG. 5.
At reference numeral 108 the user attempts log-in at a PoP containing a service selection gateway—either directly or through an intermediate network access server or other intermediate device.
At reference numeral 110 the user signals the SSG of a selected QoS level to use. This may be for all packets sent during the session, for all packets sent during the session of a particular protocol type or from or to a particular Layer 4 port number (e.g., voice over IP might be set to a higher QoS than standard traffic) and the like. This can be accomplished through a conventional menuing system, through a dashboard application program in communication with the SSG and/or through direct command to the SSG.
At reference numeral 112 and SSG optionally sends accounting packets detailing the user's use of the QoS level within the data communications network so that pay-per-use may be realized.
At reference numeral 114 the SSG applies the user selected QoS levels to selected packets in accordance with policy set by the user to the ToS precedence bits of the ToS field of IP packets sent by the user. This happens until the user selects another QoS level or logs-out.
Alternative Embodiments
While embodiments and applications of the invention have been shown and described, it would be apparent to those of ordinary skill in the art, after a perusal of the within disclosure, that many more modifications than mentioned above are possible without departing from the inventive concepts herein. The invention, therefore, is not to be restricted except in the spirit of the appended claims.
Zhang, Shujin, Jin, Jane Jiaying, Chu, Jie, Dos Santos, Maria Alice, Lou, Shuxian
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